Does the mirrored-storage vendor guarantee the sequence of all writes to all the LUNs at the remote-site exactly matches the sequence of writes to the local site....? If not.. the file system on the remote-site could be left in an inconsistent state when the communications line is cut...
Guaranteeing sequencing to each LUN is not sufficient, because a typical GPFS file system has its data and metadata spread over several LUNs. From: "Olaf Weiser" <olaf.wei...@de.ibm.com> To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org> Date: 03/14/2018 07:19 PM Subject: Re: [gpfsug-discuss] Underlying LUN mirroring NSD impact Sent by: gpfsug-discuss-boun...@spectrumscale.org HI Mark.. yes.. that's possible... at least , I'm sure.. there was a chapter in the former advanced admin guide of older releases with PPRC .. how to do that.. similar to PPRC , you might use other methods , but from gpfs perspective this should'nt make a difference.. and I had have a german customer, who was doing this for years... (but it is some years back meanwhile ... hihi time flies...) From: Mark Bush <mark.b...@siriuscom.com> To: "gpfsug-discuss@spectrumscale.org" <gpfsug-discuss@spectrumscale.org> Date: 03/14/2018 09:11 PM Subject: [gpfsug-discuss] Underlying LUN mirroring NSD impact Sent by: gpfsug-discuss-boun...@spectrumscale.org Is it possible (albeit not advisable) to mirror LUNs that are NSD’s to another storage array in another site basically for DR purposes? Once it’s mirrored to a new cluster elsewhere what would be the step to get the filesystem back up and running. I know that AFM-DR is meant for this but in this case my client only has Standard edition and has mirroring software purchased with the underlying disk array. Is this even doable? Mark _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org https://urldefense.proofpoint.com/v2/url?u=http-3A__gpfsug.org_mailman_listinfo_gpfsug-2Ddiscuss&d=DwICAg&c=jf_iaSHvJObTbx-siA1ZOg&r=cvpnBBH0j41aQy0RPiG2xRL_M8mTc1izuQD3_PmtjZ8&m=vq-nGaYTObfhVeW9E8fpLCJ9MIi9SNCiO5yYfXwJWhY&s=9o--h1_iFfwOmI2jRmxRjZSJX7IfQSFwUi6AfFhEas0&e=
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